Monostate pattern #85

monostate/index.md

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+---
+layout: pattern
+title: MonoState
+folder: monostate
+permalink: /patterns/monostate/
+categories: Creational
+tags: Java
+---
+
+**Intent:** Enforces a behaviour like sharing the same state amongst all instances.
+
+![alt text](./etc/monostate.png "MonoState")
+
+**Applicability:** Use the Monostate pattern when
+
+* The same state must be shared across all instances of a class.
+* Typically this pattern might be used everywhere a SingleTon might be used. Singleton usage however is not transparent, Monostate usage is.
+* Monostate has one major advantage over singleton. The subclasses might decorate the shared state as they wish and hence can provide dynamically different behaviour than the base class.
+
+**Typical Use Case:**
+
+* the logging class
+* managing a connection to a database
+* file manager
+
+**Real world examples:**
+
+Yet to see this.